Was it the plantation owners who received the money made from selling their African slaves at an auction or someone else?

Yes, given the context.

Explanation:

As long as the plantation owner owned the slave and it was written down as his property in his inventory, he could do whatever he wanted with it and so if he sold it, since he owned it he would get all the profit.

cause you are attracted to the features of girls or if you are a boy you are attracted to the features of a boy.